D2.3

Lead Beneficiary: OBSPARIS

Beneficiaries involved: KO

Due Date: month 36

Goal

The aim of this project is to deliver magnetograms of active regions (size 4 arcmin x 4 arcmin) at high temporal cadence (of the order of 1 min) with a pixel size of 0.5 arc sec (spatial resolution of 1 arc sec, which is the best seeing possible at Meudon). The instrumental setup will be implemented for line of sight (LOS) magnetograms in NaD1 589.6 nm; the observing mode will be the Multichannel Subtractive Double Pass (MSDP) at Meudon Solar Tower (MST).

Progress so far

This is a major instrumental project which takes time and which depends strongly on the presence of sunspots on the solar surface. The calendar is the following:

First step: May 2009 observe LOS magnetic fields in H alpha, FOV 4' x 1' with the present H alpha optical system

Second step: June 2009 observe LOS magnetic fields in NaD1, FOV 4' x 30" after installation of the NaD1 optical system (needs optical work)

Third step: autumn 2009 Replacement of the old (and slow) CCD by a faster CCD in order to reduce time between I+V and I-V observations and increase temporal resolution (needs mechanical and computer work)

Fourth step: fall 2010 Achieve the solar surface scanning device in order to pass the FOV from 4' x 30" to 4' x 4' (needs mechanical, electronic and computer work)

Fifth step: end 2010 start observing campaigns of active regions

People involved part time: Guillaume Molodij, Jean-Marie Malherbe, Marion Bonafous, Frédéric Dauny, Sylvain Pau

Problems

We have to face with manpower problems at different levels:

- technical: machanics, electronics, data acquisition systems

- observations: we have no manpower to do systematic observations, we will participate only to specific campaigns

We have also to face with with technical problems with the telescope due to obsolete mechanics

Solutions: milestone date to be shifted from end 2009 to end 2010